This pack of black atoms are used typically to represent carbon atoms and is for extending your existing set or for replacing lost atoms. Each pack contains 10 balls with four holes in each ball in a tetrahedral array. Each atom is 23 mm diameter.

Why would I need these? You could use them to represent a tetrahedral carbon atom in a compound such as methane or ethane.

The Molymod® system is the original, unique, dual-scale system of high quality low-cost molecular models. These enormously popular sets are ideal for students but are also used by scientists all over the world.

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This pack of 10 purple atoms are often used to represent phosphorus atoms and is for extending an existing set or replacing lost atoms. Each pack contains 10 balls with five holesin each ball in a trigonal bipyramidal arrangement.